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Taken from World Wide Words

Its principal sense in English is “(a person or thing) which stays in some place only for a short time”; though this necessarily implies moving from place to place, it is the stay which is emphasised, not the travelling.
NASA named the rover which forms part of the Mars Pathfinder mission Sojourner following a year-long worldwide competition; the winner was Valerie Ambroise of Bridgeport, Connecticut, who suggested it be named after Sojourner Truth, a nineteenth-century black feminist and campaigner for the abolition of slavery
by Houses0nfire April 19, 2008